Electrically driven shaker conveyer



July 14, 1931. T. G. NY BORG ET AL 17,314,732

ELECTRICALLY DRIVEN SHAKER CONVEYER Original Filed Feb. 17, 1927 T nqs EORq NYBO MaRK FREDeRmK Hlqqms,

JW5-JW Patented .luly 14, 1931 warren era-res PATENT Fries ELECTRIGALLY DRIVEN SHAKER CONVEYER Original application filed February 1'7, 1927, Serial No. 169,117, and in Great Britain September 15, 1926.

Divided and this application filed. May 28, 1928.

J so that it can be used as a right hand or left hand drive without alteration.

Preferably the reciprocating motion is produced by a crank driving-a crosshead by means of the connecting rod and pin, the crosshead transmitting its motion to a second crosshead by means of a double acting spring. The crank shaft may be driven by gear wheel reducing gear from a motor mounted on the housing of the unit. All the gearing is preferably totally enclosed and running in oil bath. The crank may be arranged for adjustable stroke.

Referring to the accompanying draw- 1ngs:'-

Fig. 1 is a part sectional plan with one half of the housing removed.

Fig. 2 is a sectional view of the detail illustrating the means for adjusting the crank.

The housing of the unit is formed intwo parts and substantially symmetrically about the longitudinal axis of the unit so that when one portion of the housing is removed all parts are readily accessible.

The housing is cast with channel formed supports 0 to rest on a hard floor or on wooden beams 03 if found necessary on soft floors.

An electric motor 6 is mounted at one end of the housing and is adapted to drive the crank shaft f through counter shaft 9 and gear wheels h, j, k, m, n. The crank 0 reciprocates the crosshead p by means of a connecting rod g which transmits its motion to a second crosshead r by means of a double acting spring .2.

Serial No. 281,321.

As appears from the drawings a very short connectingrod is used. By using a simple crank motion with the very short connecting rod a, a high acceleration is produced at the one end of the stroke and a smaller acceleration at the other end of the stroke. As the pressure in the direction of the stroke is in proportion to the acceleration, by introducing the adjustable double action spring 8 in the sliding crosshead p, we adjust the springs so that the initial pressure of the spring 5 is larger than the pressure due to the acceleration at the one end but smaller than the acceleration at the other end.

By this means the spring 8 will not give at the end of the stroke with the smaller accelerationbut only at the end with the larger acceleration under ordinary running, but if any mechanical shocks occur the spring 3 :will act as a buffer in both directions.-

As the acceleration due to the short connecting rod is larger at the one end of the stroke, than at the other, the pressure tending to compress the spring is also larger at the one end of the stroke than at the other end; If the initial pressure of the spring is larger than the pressure due to'the pressure at the end with the smaller acceleration, but smaller than the pressure due to the accelera tion at the other end, it follovs that the spring will not be compressed at the end of the stroke with the smaller acceleration and it cannot therefore make any alteration to the acceleration of the trough. asthis'must follow the acceleration given by the crank and connecting rod.

tthe other end with the larger acceleration the springwill be compressed as soon as the pressure due to the acceleration exceeds the initial pressure of the spring and thereby allows the trough to move further than due to the stroke of the crank. This means that'the acceleration or retardation of the trough before finishing its stroke is delayed in respect of the acceleration due to the crank and connecting rod, but at the beginning of the return stroke it is increased, correspondingly.

. head, a coupling member for connection with a shaker conveyer, said cross head slidable relative to the coupling member in both directions, and a single spring disposed between said cross head and coupling member and opposing relative motion between the cross head and coupling member in both directions, thereby absorbing shocks and effecting changes in acceleration on both strokes.

2. In a driving device for shaker conveyors, a driven shaft, a single crank connected thereto having a pin, an eccentric connected to the pin, a cross head, a connecting rod connecting said eccentric and cross head, a coupling member for connection with the conveyor, and a single spring device disposed within the cross head and between it and the coupling member, opposing the motion of the conveyer in both directions, thereby absorbing the shocks and effecting small acceleration on the forward stroke, and a larger followed by a smaller acceleration on the return stroke.

3. In a driving device for shaker convey.

ers, a driven shaft, a single crank connected thereto having a pin, an eccentric connected to the pin, a cross head, a connecting rod between one and one-half and two and onehalf times the length of the crank connecting said eccentric and cross head, a coupling member for connection with the conveyer, and a single spring device disposed within the cross head and between it-and the coupling member, opposing the motion of the conveyer in both directions, thereby absorbing shocks and effecting small acceleration on the forward stroke, and a larger followed by a smaller acceleration on the return stroke.

4. In a driving device for shaker conveyers, a driven shaft, a crank arm connected with said shaft, a cross head, a connecting rod connecting said crank arm and cross head, a coupling member for connection with a shaker conveyer, said cross head slidable relative to the coupling member in both directions, a single spring disposed between said cross head and coupling member and opposing relative motion between the cross head and coupling member in both directions and means for adjusting the spring so that it will yield to pressure due to predetermined accelerations, thereby absorbing shocks and effecting small accelerations on the forward stroke and a larger followed by a smaller acceleration on the return stroke.

5. In a driving device for shaker conveyers, a shaft, a crank arm fast to said shaft, a crank pin on said arm, a sliding cross head, an eccentric secured to said pin, a short connecting rod connecting said eccentric and cross head, a coupling member for connection with a shaker conveyer, said cross head slidable relative to the cou pling member in both directions, and a single spring disposed between said cross head and coupling member and opposing relative motion between the cross head and coupling member in both directions, thereby absorbing shocks and effecting changes in acceleration on both strokes.

6. In a driving device for shaker conveyers, a driven shaft, a crank arm connected with said shaft, a cross head, a connecting rod connecting said crank arm and cross head, a coupling member for connection with a shaker conveyor, said. cross head slidable relative to the coupling member in both directions, a single spring disposed between said cross head and coupling member and opposing relative motion between the cross head and coupling member in both directions, reducing gearing for driving the driven shaft, and means for adjusting the stroke of the crank arm.

7. In a driving device for shaker con-' veyers, a shaft, a crank on said shaft, a sliding cross head having an inner tubular recess, and an outer tubular recess communicating with and of larger diameter than said inner recess, a short connecting rod between said crank and cross head, a coupling spindle in said cross head having thereon a sleeve slidable in said recess of smaller diameter, a second sleeve secured to said spindle and slidable in a tubular bushing screwethreaded within the recessed portion of the cross head of larger diameter, and a spiral spring confined between said sleeves adapted to cushion the shocks due to movements of the cross head and other parts in both directions, and for increasing the acceleration.

In witness whereof We afiix our signatures.

TAGE GEORG NYBORG. MARK FREDERICK HIGGINS. 

